Fig. 1. Schematic illustration of a capsule moving through a pipe
Fig. 3. Time-lapse images of a capsule moving through a pipe. The inner diameter of the pipe, the capsule diameter (2R), and mean flow speed of liquid (v) are 32 mm, 31 mm, and 0.37 m/s, respectively. In two consecutive images, the travel distance of the capsule is equal to 76 mm.
Fig. 4. (a) Control volume to examine the fluid layer between the wall and capsule, shown as the dashed line box. (b) Free body diagram for the capsule. (c) Control volume to examine the mass conservation, shown as the dashed line box.
Fig. 2. (a) Schematic illustration of the experimental set-up. (b) Capsule used in our experiments. (c) Disassembly of the capsule composed of the acrylic housings and the neodymium magnets.
Fig. 5. Dependence of t.he capsule speed on the mean flow speed of the liquid. (a) Experimental results and theoretical prediction for e* = 0.03. The solid and dashed lines are the theoretical predictions of the capsule speed for ρc = 880 kg/m3 and ρc = 3000 kg/m3, respectively. (b) Experimental results and theoretical prediction for e* = 0.07. The solid, dashed, and dotted lines are the theoretical predictions of the capsule speed for ρc = 880 kg/m3, ρc = 2000 kg/m3, and ρc = 3000 kg/m3, respectively.
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